1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 import static art.Redefinition.doCommonClassRedefinition;
18 
19 import java.util.Base64;
20 import java.util.function.Consumer;
21 import java.lang.reflect.Method;
22 
23 public class Main {
24   static final boolean ALWAYS_PRINT = false;
25 
26   // import java.util.function.Consumer;
27   // class Transform {
28   //   public void sayHi(int recur, Consumer<String> reporter, Runnable r) {
29   //     privateSayHi(recur, reporter, r);
30   //   }
31   //   private void privateSayHi(int recur, Consumer<String> reporter, Runnable r) {
32   //     reporter.accpet("hello" + recur + " - transformed");
33   //     if (recur == 1) {
34   //       r.run();
35   //       privateSayHi(recur - 1, reporter, r);
36   //     } else if (recur != 0) {
37   //       privateSayHi(recur - 1, reporter, r);
38   //     }
39   //     reporter.accept("goodbye" + recur + " - transformed");
40   //   }
41   // }
42   private static final byte[] CLASS_BYTES = Base64.getDecoder().decode(
43     "yv66vgAAADQANAoADgAbCgANABwHAB0KAAMAGwgAHgoAAwAfCgADACAIACEKAAMAIgsAIwAkCwAl" +
44     "ACYIACcHACgHACkBAAY8aW5pdD4BAAMoKVYBAARDb2RlAQAPTGluZU51bWJlclRhYmxlAQAFc2F5" +
45     "SGkBADUoSUxqYXZhL3V0aWwvZnVuY3Rpb24vQ29uc3VtZXI7TGphdmEvbGFuZy9SdW5uYWJsZTsp" +
46     "VgEACVNpZ25hdHVyZQEASShJTGphdmEvdXRpbC9mdW5jdGlvbi9Db25zdW1lcjxMamF2YS9sYW5n" +
47     "L1N0cmluZzs+O0xqYXZhL2xhbmcvUnVubmFibGU7KVYBAAxwcml2YXRlU2F5SGkBAA1TdGFja01h" +
48     "cFRhYmxlAQAKU291cmNlRmlsZQEADlRyYW5zZm9ybS5qYXZhDAAPABAMABcAFAEAF2phdmEvbGFu" +
49     "Zy9TdHJpbmdCdWlsZGVyAQAFaGVsbG8MACoAKwwAKgAsAQAOIC0gdHJhbnNmb3JtZWQMAC0ALgcA" +
50     "LwwAMAAxBwAyDAAzABABAAdnb29kYnllAQAJVHJhbnNmb3JtAQAQamF2YS9sYW5nL09iamVjdAEA" +
51     "BmFwcGVuZAEALShMamF2YS9sYW5nL1N0cmluZzspTGphdmEvbGFuZy9TdHJpbmdCdWlsZGVyOwEA" +
52     "HChJKUxqYXZhL2xhbmcvU3RyaW5nQnVpbGRlcjsBAAh0b1N0cmluZwEAFCgpTGphdmEvbGFuZy9T" +
53     "dHJpbmc7AQAbamF2YS91dGlsL2Z1bmN0aW9uL0NvbnN1bWVyAQAGYWNjZXB0AQAVKExqYXZhL2xh" +
54     "bmcvT2JqZWN0OylWAQASamF2YS9sYW5nL1J1bm5hYmxlAQADcnVuACAADQAOAAAAAAADAAAADwAQ" +
55     "AAEAEQAAAB0AAQABAAAABSq3AAGxAAAAAQASAAAABgABAAAAAgABABMAFAACABEAAAAkAAQABAAA" +
56     "AAgqGywttwACsQAAAAEAEgAAAAoAAgAAAAQABwAFABUAAAACABYAAgAXABQAAgARAAAAnwAEAAQA" +
57     "AABhLLsAA1m3AAQSBbYABhu2AAcSCLYABrYACbkACgIAGwSgABUtuQALAQAqGwRkLC23AAKnABAb" +
58     "mQAMKhsEZCwttwACLLsAA1m3AAQSDLYABhu2AAcSCLYABrYACbkACgIAsQAAAAIAEgAAACIACAAA" +
59     "AAcAHgAIACMACQApAAoANQALADkADABCAA4AYAAPABgAAAAEAAI1DAAVAAAAAgAWAAEAGQAAAAIA" +
60     "Gg==");
61   private static final byte[] DEX_BYTES = Base64.getDecoder().decode(
62     "ZGV4CjAzNQCevtlr8B0kh/duuDYqXkGz/w9lMmtCCuRoBQAAcAAAAHhWNBIAAAAAAAAAALAEAAAg" +
63     "AAAAcAAAAAkAAADwAAAABgAAABQBAAAAAAAAAAAAAAoAAABcAQAAAQAAAKwBAACcAwAAzAEAAPYC" +
64     "AAAGAwAACgMAAA4DAAARAwAAGQMAAB0DAAAgAwAAIwMAACcDAAArAwAAOAMAAFcDAABrAwAAgQMA" +
65     "AJUDAACwAwAAzgMAAO0DAAD9AwAAAAQAAAYEAAAKBAAAEgQAABoEAAAuBAAANwQAAD4EAABMBAAA" +
66     "UQQAAFgEAABiBAAABgAAAAoAAAALAAAADAAAAA0AAAAOAAAADwAAABEAAAATAAAABwAAAAUAAAAA" +
67     "AAAACAAAAAYAAADUAgAACQAAAAYAAADcAgAAEwAAAAgAAAAAAAAAFAAAAAgAAADkAgAAFQAAAAgA" +
68     "AADwAgAAAQADAAQAAAABAAQAGwAAAAEABAAdAAAAAwADAAQAAAAEAAMAHAAAAAYAAwAEAAAABgAB" +
69     "ABcAAAAGAAIAFwAAAAYAAAAeAAAABwAFABYAAAABAAAAAAAAAAMAAAAAAAAAEgAAALQCAACeBAAA" +
70     "AAAAAAEAAACKBAAAAQABAAEAAABpBAAABAAAAHAQAwAAAA4ABgAEAAQAAABuBAAAUAAAACIABgBw" +
71     "EAUAAAAbARoAAABuIAcAEAAMAG4gBgAwAAwAGwEAAAAAbiAHABAADABuEAgAAAAMAHIgCQAEABIQ" +
72     "MwMpAHIQBAAFANgAA/9wQAEAAlQiAAYAcBAFAAAAGwEZAAAAbiAHABAADABuIAYAMAAMABsBAAAA" +
73     "AG4gBwAQAAwAbhAIAAAADAByIAkABAAOADgD4f/YAAP/cEABAAJUKNoEAAQABAAAAIEEAAAEAAAA" +
74     "cEABABAyDgAAAAAAAAAAAAIAAAAAAAAAAQAAAMwBAAACAAAAzAEAAAEAAAAAAAAAAQAAAAUAAAAD" +
75     "AAAAAAAHAAQAAAABAAAAAwAOIC0gdHJhbnNmb3JtZWQAAihJAAIpVgABPAAGPGluaXQ+AAI+OwAB" +
76     "SQABTAACTEkAAkxMAAtMVHJhbnNmb3JtOwAdTGRhbHZpay9hbm5vdGF0aW9uL1NpZ25hdHVyZTsA" +
77     "EkxqYXZhL2xhbmcvT2JqZWN0OwAUTGphdmEvbGFuZy9SdW5uYWJsZTsAEkxqYXZhL2xhbmcvU3Ry" +
78     "aW5nOwAZTGphdmEvbGFuZy9TdHJpbmdCdWlsZGVyOwAcTGphdmEvdXRpbC9mdW5jdGlvbi9Db25z" +
79     "dW1lcgAdTGphdmEvdXRpbC9mdW5jdGlvbi9Db25zdW1lcjsADlRyYW5zZm9ybS5qYXZhAAFWAARW" +
80     "SUxMAAJWTAAGYWNjZXB0AAZhcHBlbmQAEmVtaXR0ZXI6IGphY2stNC4yNAAHZ29vZGJ5ZQAFaGVs" +
81     "bG8ADHByaXZhdGVTYXlIaQADcnVuAAVzYXlIaQAIdG9TdHJpbmcABXZhbHVlAAIABw4ABwMAAAAH" +
82     "DgEeDzw8XQEeDxktAAQDAAAABw48AAICAR8cBxcBFxAXAxcOFwUXDRcCAAACAQCAgATUAwEC7AMC" +
83     "AZwFDwAAAAAAAAABAAAAAAAAAAEAAAAgAAAAcAAAAAIAAAAJAAAA8AAAAAMAAAAGAAAAFAEAAAUA" +
84     "AAAKAAAAXAEAAAYAAAABAAAArAEAAAMQAAABAAAAzAEAAAEgAAADAAAA1AEAAAYgAAABAAAAtAIA" +
85     "AAEQAAAEAAAA1AIAAAIgAAAgAAAA9gIAAAMgAAADAAAAaQQAAAQgAAABAAAAigQAAAAgAAABAAAA" +
86     "ngQAAAAQAAABAAAAsAQAAA==");
87 
88   // A class that we can use to keep track of the output of this test.
89   private static class TestWatcher implements Consumer<String> {
90     private StringBuilder sb;
TestWatcher()91     public TestWatcher() {
92       sb = new StringBuilder();
93     }
94 
95     @Override
accept(String s)96     public void accept(String s) {
97       if (Main.ALWAYS_PRINT) {
98         System.out.println(s);
99       }
100       sb.append(s);
101       sb.append('\n');
102     }
103 
getOutput()104     public String getOutput() {
105       return sb.toString();
106     }
107 
clear()108     public void clear() {
109       sb = new StringBuilder();
110     }
111   }
112 
main(String[] args)113   public static void main(String[] args) {
114     doTest(new Transform());
115   }
116 
117   private static boolean retry = false;
118 
doTest(Transform t)119   public static void doTest(Transform t) {
120     final TestWatcher reporter = new TestWatcher();
121     Method say_hi_method;
122     Method private_say_hi_method;
123     // Figure out if we can even JIT at all.
124     final boolean has_jit = hasJit();
125     try {
126       say_hi_method = Transform.class.getDeclaredMethod(
127           "sayHi", int.class, Consumer.class, Runnable.class);
128       private_say_hi_method = Transform.class.getDeclaredMethod(
129           "privateSayHi", int.class, Consumer.class, Runnable.class);
130     } catch (Exception e) {
131       System.out.println("Unable to find methods!");
132       e.printStackTrace();
133       return;
134     }
135     // Makes sure the stack is the way we want it for the test and does the redefinition. It will
136     // set the retry boolean to true if we need to go around again due to jit code being GCd.
137     Runnable do_redefinition = () -> {
138       if (has_jit &&
139           (Main.isInterpretedFunction(say_hi_method, true) ||
140            Main.isInterpretedFunction(private_say_hi_method, true))) {
141         // Try again. We are not running the right jitted methods/cannot redefine them now.
142         retry = true;
143       } else {
144         // Actually do the redefinition. The stack looks good.
145         retry = false;
146         reporter.accept("transforming calling function");
147         doCommonClassRedefinition(Transform.class, CLASS_BYTES, DEX_BYTES);
148       }
149     };
150     do {
151       // Run ensureJitCompiled here since it might get GCd
152       ensureJitCompiled(Transform.class, "sayHi");
153       ensureJitCompiled(Transform.class, "privateSayHi");
154       // Clear output.
155       reporter.clear();
156       t.sayHi(2, reporter, () -> { reporter.accept("Not doing anything here"); });
157       t.sayHi(2, reporter, do_redefinition);
158       t.sayHi(2, reporter, () -> { reporter.accept("Not doing anything here"); });
159     } while(retry);
160     System.out.println(reporter.getOutput());
161   }
162 
hasJit()163   private static native boolean hasJit();
164 
isInterpretedFunction(Method m, boolean require_deoptimizable)165   private static native boolean isInterpretedFunction(Method m, boolean require_deoptimizable);
166 
ensureJitCompiled(Class c, String name)167   private static native void ensureJitCompiled(Class c, String name);
168 }
169